Article Abstract:
Accurate crystal structure determination of Ti11Se4 involves the use of high-resolution electron microscopy. Crystallographic image processing and X-ray powder data allow the structure refinement. The atoms show a shift of 0.2 angstroms on refinement. The presence of alternating two and four condensed octahedral chains in every second layer, and the type of octahedral distortions in Ti11Se4 crystals are similar to those in Ti8Se3. The crystals have a Ti content of 72(1) atomic % and a C2/m symmetry.
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Article Abstract:
Recent advancements in the field of electron cryomicroscopy have resulted in the detection of a new viral capsid fold within the hepatitis B virus core protein. The four-helix bundle within the virus core has been detected at a resolution of 7.4 angstroms. High-resolution three-dimensional maps of the virus-receptor complex were also derived by docking the atomic structures for the virus and for the receptor.
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Article Abstract:
Cryo-electron microscopy at a resolution of 9 angstroms reveals that the stem of the hepatitis B virus capsid is a 4-helix bundle. The stem, which protrudes as a spike on the capsid's outer surface, is formed by the pairing of alpha-helical hairpins from both subunits. The individual alpha-helices in parallel bundles have a center-to-center spacing of 10 angstroms, a value similar to other 4-helix bundles.
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